* sgml-catalog_cat_include(), sgml-catalog_pkg_postinst(),
sgml-catalog_pkg_postrm():
Implemented a different logic to keep track of the catalogs to
install/remove, since the previous one caused problems if
sgml-catalog_cat_include() was called from pkg_setup(). See bug #98680.

Fixing bugs, I hope. The new behavior is NOT to remove the catalog if it still
exists, regardless. This might run into trouble for multi-tiered catalog
installations, but I don't think we have any of those now, so this should solve
all outstanding problems.

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